There is a growing interest in the history of relations between the English, Scottish, Welsh and Irish as the United Kingdom and Ireland begin to construct new political arrangements and to become more fully integrated into Europe. This book brings together recent work on how these relations developed between 900 and 1300, a period crucial for the formation of national identities. The conquest of England by the Normans and the subsequent growth in English power required the inhabitants of Britain and Ireland to reassess their dealings with each other. Old ties were broken and new ones formed. Economic change, the influence of chivalry, the transmission of literary motifs, and questions of aristocratic identity are among the topics tackled here by leading scholars from Britain, Ireland and North America. Little has been published hitherto on this subject, and the book marks a major contribution to a topic of lasting interest.